CVE-2026-78680CWE-426

CVE-2026-78680

High · published August 25, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
6.9
In the wild
Unconfirmed
What it is

NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in dependencygraph.dot2img and AlignedSent._repr_svg_, allowing attackers to execute arbitrary code by placing a malicious dot binary in the search path or current working directory. Attackers can exploit bare-name binary resolution on Windows via the current working directory or on Unix-like systems via relative PATH entries to execute their binary instead of the legitimate Graphviz tool.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.5 · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00177 · 6.9th percentile
Weakness
CWE-426 · Untrusted Search Path
Published
2026-08-25T06:16Z
References (3)
https://github.com/nltk/nltk/security/advisories/GHSA-6hwm-xvph-95vm · [email protected]https://www.vulncheck.com/advisories/nltk-before-arbitrary-code-execution-via-graphviz-dot-binary · [email protected]https://github.com/nltk/nltk/security/advisories/GHSA-6hwm-xvph-95vm · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 26 AUG 08:27Z
    EPSS moved — → 0%
    epss
  • 25 AUG 01:30Z
    NLTK before 3.10.3 Arbitrary Code Execution via Graphviz dot Binary
    cvelistv5